How long do you wait?

[ctoychik]

My gar went over a divider to kill silver aro (so that case was doomed if they were together)

RTC ate arapaima (there was no warning) - happend several days after introduction. RTC showed no interest in new comers, then BOOM one morning a tail is sticking out of RTC (same thing happended earlier with another silver aro and RTC - several weeks, then a very fat RTC and no silver). Same RTC ate a newly donated albino O after several weeks (the original older O is till there after years).

Chasing and nippin occurs in my aro comm. Jar is being chases around by 3 silvers (one in particular). Fins on everybody are a smidge broken (one line). I keep an eye out for loss of scales and/or scaring (due to jumping etc) eyes also. So far so good. Jar does not seem too stresses (in as far as it is still eating like a pig). Silvers are def not stresses and cruising around on top

I say look at overall damage to the fish and level of stress. Eating of tankmates is unpredictable when they can be swallowed. If you get a particularly murderous fish ...

 

[Gr8KarmaSF]

bmup

 

[twk1]

I would say it depends on how bad the situation is, if the aggro fish bullies the victim fish for a while and stops and goes back later to bully again and then stops again, and keep repeating this.... then i would leave them for a few days to a week. BUT if the fish nips and bullies non stop and if there are signs of major stress in the fish that is being bullied and seems Really weak then i pull the fish out.
But i've never had a case where i had to pull a fish out immediately, i've had to pull a fish out three days after it has been harassed and seems week. But brought it to recovery... and now after i powerfed it and plumped it up, it went back to the tank and haven't seen any real problems.

 

[cichlid2006]

from my experience i have waited a few hours to give them a chance to establish the pecking order and let the alpha fish establish dominance over the newcomer. ive found in most cases once this has happened then the tank quickly settles. i have often found the first hour to be the make or break time. if its a battlefield within 10mins then the long term chances of success deminish rapidly.
although saying that ive had a sev that mauled my P. Loisellei and con even after the GT had established his dominance in the tank, i gave that a couple of weeks to calm but it never did. he was a rogue fish though. after that ive never waited longer than 24hrs to see if a fish settles.

 

[Gr8KarmaSF]

bump

 

[Lou8337]

This thread reminds me of the one I started last night and it got the boot because it might of been offensive to some people. Although I didn't mean too offend anyone, but there are some people on Youtube that think its funny to have there so called pet fish eat each other. Seriously if they are pets why would you video them doing these things. The worst part is that the fish don't get eaten right away they end up swimming off with injuries. Its not like a feeder going straight down the hatch. I guess I should have used more discretion posting it and I appologize to anyone who saw it and got offended. I got offended watching the videos myself but I just wanted to show you guys what kind of sick people are out there.

 

[Gr8KarmaSF]

This thread reminds me of the one I started last night and it got the boot because it might of been offensive to some people. Although I didn't mean too offend anyone, but there are some people on Youtube that think its funny to have there so called pet fish eat each other. Seriously if they are pets why would you video them doing these things. The worst part is that the fish don't get eaten right away they end up swimming off with injuries. Its not like a feeder going straight down the hatch. I guess I should have used more discretion posting it and I appologize to anyone who saw it and got offended. I got offended watching the videos myself but I just wanted to show you guys what kind of sick people are out there.

Thanks for sharing with the MFK community but I dont think that it is the same type of thread. This thread is meant to give people a sense of what others deem aceptable in terms of waiting for new stock to get along. The vid you posted was more of a show off of fish fighting IMO. These vids have been around a very long time and are here to stay, so MFK does not want to promote this type of negative fish keeping.